The signs and languages were investigated for the virtual organization of knowledge by search engines. The study was based on the theory of the matrices of language and of thought, postulated by Santaella (2005), in which the sonorous, visual and verbal language was extracted. The purpose of this investigation was to establish a categorization of search engines, from the matching of these matrices of language with the virtual indexation and analog modus of search. Research results indicate that the categorization of the search engines is appropriate under the discretion of the semiotic paradigm of language in three matrices, by its way of being and function, since they are sonorous, visual and verbal based-content. Briefly, the syntax is the representation of the sonorous, the shape is the representation of the visible and the discourse is the representation of the verbal knowledge.